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r' <br /> or. Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (415) 364.9600 FAX(415) 364-9233 <br /> 404 N.Wiget Lane Walnut Creek, CA 94598 (510) 988-9600 FAX(510)988-9673 <br /> Analytical 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916) 921-9600 FAX(916)921-0100 <br /> MPIbS's6mces Client Project iCS U666al #601'5',"601 E.Kettleman Lane,--Lodi <br /> 2401 Stanwell Dr., Ste. 300 Matrix. Liquid <br /> Concord, CA 94520 <br /> Attention: Sarkis Karkarian QC Sample Group: 5091208-19 Reported: Oct 5, 1995:::; <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> Method: EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst: K. Nill K. Nill K.Nill K. Nill <br /> MS/MSD <br /> Batch#: 5091229 5091229 5091229 5091229 <br /> Date Prepared: 10/2/95 10/2/95 10/2/95 10/2/95 <br /> Date Analyzed: 10/2/95 10/2/95 10/2/95 10/2/95 <br /> Instrument I.D.#: HP-9 HP-9 HP-9 HP-9 <br /> Conc. Spiked: 20yg/L 20pg/L 20,ug/L 60pg/L <br /> Matrix Spike <br /> % Recovery: 100 105 105 115 <br /> . Matrix Spike <br /> Duplicate % <br /> Recovery: 110 115 115 123 <br /> Relative% <br /> Difference: 9.5 9.1 9.1 7.0 <br /> LCS Batch#: 9LCS100295 9LCS100295 9LCS100295 9LCS100295 <br /> Date Prepared: 10/2/95 10/2/95 10/2/95 10/2/95 <br /> Date Analyzed: 10/2/95 10/2/95 10/2/95 10/2/95 <br /> Instrument I.D.#: HP-9 HP-9 HP-9 HP-9 <br /> LCS % <br /> Recovery: 91 99 101 111 <br /> Recovery <br /> Control Limits: 71-133 72-128 72-130 71-120 <br /> Please Note: <br /> The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> SEQUOIA ANALYTICAL, #1271 preparation,and analytical methods employed for the samples. The matrix spike is an aliquot of sample <br /> fortified with known quantities of specific compounds and subjected to the entire analytical procedure. If <br /> Signature on File the recovery of analytes from the matrix spike does not fail within specified control limits due to matrix <br /> interference,the LCS recovery is to be used to validate the batch. <br /> Alan B. Kemp <br /> Project Manager <br /> p 5091208.MPD <6> <br /> fib' <br />